Malicious PDF — malware analysis report

Static analysis result for SHA-256 b10ce7135c38a4a3…

MALICIOUS

PDF

76.7 KB Created: 2021-04-02 07:26:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: cd101845c412f5f576ef4e1e46989feb SHA-1: 1482af53f3c51f739b7ad60d45a04bc5bb37c49e SHA-256: b10ce7135c38a4a3438051865c1f309a98577248dad577a76ed2aa920954f612
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://gimoguvi.ru/strik?utm_term=todos+los+tipos+de+fichas+bibliograficas PDF link annotation
    • https://cdn.sqhk.co/jivonaxadu/iiKhbrb/wujaja.pdfIn PDF document text
    • https://cdn.sqhk.co/rufosopufu/1giii5l/70533740277.pdfIn PDF document text
    • https://cdn.sqhk.co/xixujipum/hhihdhc/33190589739.pdfIn PDF document text
    • http://lupazul.mywebcommunity.org/75052535938.pdfIn PDF document text
    • https://cdn.sqhk.co/tiwoxebu/iiFpBji/jowasemumoruwexuxa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456116/normal_5fd1e53c506ae.pdfIn PDF document text
    • https://cdn.sqhk.co/lidojuxuxiro/ihih0ic/potiwivapugo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459483/normal_605d2df23daad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379230/normal_602a0f14abb8b.pdfIn PDF document text
    • http://xakidofe.sportsontheweb.net/a_level_computer_science_9608_notes.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://9df6e0af-a028-4e88-91ba-61a1b37318d5.filesusr.com/ugd/7c1f05_5fbf18930b204a3cb6c84e99defb2c01.pdf?index=trueIn PDF document text
    • https://6d251753-49d0-4f5b-a278-10ed1cacc9d0.filesusr.com/ugd/5c139a_8e94ed28f2d64574837f6b61a680c481.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/757f6b31-53aa-4af6-b927-562e53fc4953/maytag_bravos_washing_machine_reviews.pdfIn PDF document text
    • https://6b9ff03a-ef48-417a-a14c-919df0f903d0.filesusr.com/ugd/f459ea_17c54b40e15a4f349d01c01f6e432e8b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b991768-bfb6-4329-a564-2c9e01aceacd/guxegazakokonebif.pdfIn PDF document text
    • https://d6477b75-8e4d-4453-8bbc-a86a6009e57c.filesusr.com/ugd/261d41_b9389c0758224f79ac8d9ccba5df4dc7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/542e3be0-5fbf-4946-b3ca-c69cfce355b8/can_you_whitewash_laminate.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5280da50-fd66-461c-b4a4-170c5700d178/yamaha_p255_second_hand.pdfIn PDF document text
    • http://kivarutumo.myartsonline.com/87261355082.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ead4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAD4 5504 bytes
SHA-256: 82b6b377b077a3edd118487c904d8f2db0115de78a893cedc0bbb3154055e474
font_01_sfnt_off0000fd84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD84 11616 bytes
SHA-256: 677625f7be9e94746aa3f2ac4991ad9763cd11c8512133392e977776a71a6cf4